Appearance Objects - Interactive Web-Based Virtual Reality with Java 3D - page 83

using the setPolygonMode method to POLYGON_POINT to ensure that only the vertices
are rendered. Specifically, line 17 creates a new Appearance object, line 18 creates a new
PolygonAttributes object, line 20 sets the PolygonMode, and line 23 sets the PolygonAt-

Figure 10. Code segment PolygonAttributesExample1.java

1. public class AppearanceCULL_NONE extends Applet

2. {

3. public class Letter_E extends Shape3D

4. {

5. int vertex = 4;

6. //constructor

7. public Letter_E()

8. {

9. this.setGeometry(Quad1Geometry());

10. this.addGeometry(Quad2Geometry());

11.

12. this.addGeometry(Quad3Geometry());

13. this.addGeometry(Quad4Geometry());

14. this.setAppearance(Letter_E_Appearance());

15. }

16. private Appearance Letter_E_Appearance()

17. {

18. Appearance look = new Appearance();

19. PolygonAttributes polyAttrib = new PolygonAttributes();

20. //to make both sides of the face appear

21. polyAttrib.setCullFace(PolygonAttributes.CULL_NONE);

22. look.setPolygonAttributes(polyAttrib);

23. return look;

24. }

Figure 11. Results from PolygonAttributesExample1.java. Note that the CULL_NONE
attribute results in both the front and back of the letter E to be seen even after it has been
rotated